Typewriting machine



Oct. 4

.1927 A. e. F. KUROWSKI TYPEWRITING MACHINE Filed May 27, 1924 2Sheets-Sheet 1 //VVEN7'0R.

HIS A TTORNE/Y.

Oct. 4,1927.

A. G. F. KUROWSKI TYPEiWRITING MACHINE Filed May 27, 1924 2 Sheets-Sheet2 HIS ATT0R/v5 Patented Get. 4, 1927.

UNITED STATES 1,643,987 PATENT OFFICE.

ALFRED G. F. K UROWSKI, OF BROOKLYN NEW YORK, ASSIGNOR TO UNDER/WOODTYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed May 27,

This invention relates to ribbon 'mechanism for front-strike writingmachines of the character in which either one or another color of aribbon may be used at will.

The improvement is illustrated in connection with a machine having abichrome ribbon mechanism in which two fields of color are united in asingle ribbon. and in which a shift device is provided to cause eitherof the colors to be brought into the field to cover the printing pointat the type strokes.

One feature of the invention contemplates improved and simplified meansfor vibrating the ribbon to the printing field, the mechanism operatingto prevent overthrow of the ribbon carrier.

Another feature ofthe invention embodies the provision of mechanismincluding adjustment notches and a detent for engagement with thenotches to set the mechanism to obtain the desired movement of theribbon vibrator for throwing either color of a bichrome ribbon into theprinting field or to render the ribbon mechanism inactive. The notchesare adjustable with relation to each other to provide for accuratelyadjusting the ribbon stroke to the typing field. Thus the stroke oftheribbon may be accurately adjusted to bring the exact mid portion ofeither color-band to the center of the types. This insures againsttwo-color printing or bleeding.

Another feature is the provision of a ribbon vibrator guided by thinflanges on the sides of the type-guide, the flanges projecting beyondthe top of the type guide, so as to accommodate the extreme movement ofthe ribbon vibrator.

A further feature of the invention provides a three position control forthe ribbon carrier, comprising a handle at the front of themachineprovided with a suitable index, and having connections to theribbon-vibrator so that either color of the bichrome ribbon may beaccurately brought to the printing point, or the vibrator may berendered inactive so as to enable the type to write off from the ribbonwhen the machine is employed to cut stencils. In ribbon-shiftingdevices, including a handle which may be set to three positions for thered and black fields of the ribbon, and a stencil position, there is atendency to accidentally shift the handle into the stencil position whenthe middle position is desired.

1924. Serial No. 716,096.

To eliminate such possibility the control mechanism is designed with aview to re quiring a special eflort on the part of the operator to shiftthe handle into the stencil position.

The parts are made of sheet-metal stamped and pressed to form, so astoenable their manufacture at low cost. This also contributes to lightnesswhich is desirable in portable machines.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a longitudinal vertical section approximately through the,center of the machine.

Figure 2 is a plan view of portions of the right-hand side of themachine.

Figure 3 is a front elevation of the extreme right-hand corner of themachine.

Figure 4 is a front view of the ribboncarrier and its'associatedtype-guide.

Figure 5 is a plan View of the ribboncarrier.

Figure 6 is an enlarged vertical section, showing the carriage-feedingelements and the ribbon-vibrating and shifting mechamsm. V

Figure 7 is a front elevation of some of the parts shown at Figure 6.

Figure 8 is a plan View of the ribbonvibrator and its associated parts.-

Figure 9 'is a two-position View, showing the operative positions ofseveral parts connected to the ribbon-vibrator for the upper or normalfield of the ribbon.

Figure. 10 is a view similar to Figure .9.

except that the parts are shown positioned for the lower field "of theribbon.

Figures 11. 12 and 13 are detail positional views, illustrating thecontrol of the ribbonvibrator.

Figure 14 is a fragmentary view of the escapement rocker and itsoperating lever.

In the embodiment illustrated, 14 indicates a series of key-leversformed in difl'erent lengths to provide four different banks toconstitute a standard keyboard. Each key-lever 14 operates to vibrate abell-crank 15 that swings about a pivot-rod 16, to cause a connection 17to vibrate its associatedtype-bar 18 about its pivot 19, to throw.'saidtype-bar from its position of rest against its pad 20 to its prlntingposition against a. platen 21 at each downward stroke of the key. Thepivot 19 comprises a circular wire adjustably secured to a type-barsegment 22 provided with radial slots to guide the type ars to a commonprinting point; said segment may be suspended from suitable ears 23forming part of the frame of'the machine. The carriage-shift-framecomprises an end plate 24 at either side, these plates being joinedtogether by a back plate 25, and suspended at both sides upon pivotsmounted on the free ends of levers 27 and 28 that may be journaled tothe rear frame of the machine in sucha manner that saidcarriage-shift-frame may be shifted-between two stop positions indicatedat 29, where adjustable stops are secured to the frame of the machine.30 indicates a frame formed with a flat section 31 and ears 32 at eitherside. These ears extend rearwardly and. are pivotally connected at tothe lower ends of arms 34 forming a swinging member pivoted to the rearframe, as at 35. The forward end of this frame 30, is formed with atongue 36, first bent upwardly at rightangles and then forwardly atright-angles. The free end of the tongue 36 passes through a slot in thesegment 22. From this descript'ion it will be seen that said frame 30will have a three-point bearing and will move to and fro through a planepractically at right-angles to the plane of the segment 22. A spring 37arranged underneath the section 31 1s secured at one end toan earforming part of said frame, and at the other end attached to astationary part of a brace 38. The tension of the spring tends to movethe whole frame forwardly against a fixed stop 39.

Upon the front face of the back plate 25 a stationary stud 40 provides abearing for an escapement-wheel 41 and an escapement pinion 42. Toco-operate with the escapement-wheel 41 suitable escapement dogs 43 aremounted upon an escapement rocker 44, pivotally hung between suitablebrackets secured to the back plate 25. The lower end of the rocker 44extends downwardly and terminates at a curved tongue 45 positioned toco-operate with a stud 46 arranged at the end of a link 47 and pivotallyconnected to a pull rod 48 that extends forwardly to the front of themachine, where the free end is pivoted ,to the upper end of an arm 49mounted at the center of a rock-shaft 50. Arms 50, secured adjacent theextremities of the rock-shaft 50, extend forwardly under the type-keysof the machine and terminate in upturned ends for connection to aspacebar 51. Asuitable spring 52 coiled about the rock-shaft 50 has oneend bent around the outer edge of the arm 49 and its other end bearingagainst the front plate of the machine to force the arm 49 rearwardlytoward .said front plate. From this construction, it will be seen thatthe depression of the space-bar 51 causes its intermediate connectionsto the carriage rocker to impart movement to the rocker 44, thuspromoting a letter-space movement of the carriage. The space-bar 51 hasno connection whatever to the ribbon-vibrating mechanism, to be pres-"plate 25. This bracket extends outwardly at right angles to the backplate, and is then bent parallel with said plate, wit-h the free endagain bent forwardly to stand at right angles to said plate and providea suitable support for a ribbon-vibrator and ribbonshifting mechanism.The ribbon-vibrator 57 includes a U-shaped section at one end mountedupon a shouldered screw 58 socured to the bracket 56. This vibrator 57includes a long goose-neck arm or vibrating arm extending forwardly to aposition immediately at the rear of the segment 22, where the free endis provided with a transverse pin 59 to provide a pivotal bearing forthe lower end of a ribbon-carrier 60. The vibrator 57 is also providedwith a short arm 57 parallel with the vibrator, and between these twoarms a transverse pivot is arranged to provide a bearing between saidarms for a- U-shaped yoke 61 comprising two parallel arms that arejoined at the free ends by a shouldered stud 62, and form an actuator.The stud 62 engages within a slotted ear 63 permanently fixed to thesection 31, and arranged to stand at right angles thereto. When motionis given the frame 30 in either direction, the car 63, moving in unisontherewith, will engage with the stud 62 and cause the yoke 61 to vibrateabout its pivot between the two arms of the ribbon-vibrator 57.

The bracket 56 is formed with an arm 26 Hit) that extends forwardlyoverthe frame 30,

said arm being perforated at the free end to provide a bearing for arock-shaft 64, positioned to align with the normal position of the stud62, said rock-shaft extending across the machine and taking a bearing inthe side frame. Upon the rock-shaft 64, adjacent its bearing in thebracket 56, a yoke piece 65 is permanently fixed, the yoke piececomprising an ear 66 at one side formed with an open slot to engage withthe stud 62, and a second ear 67 arranged parallel to the ear 66 toprovide detent means through the co-operation of a spring 68, to lock orlocate said shaft 64 at any one of three positions defined by suitablenotches cut in the edge of said detent ear. These detent positions maybe rendered adjustable by the arrangement of two shoes 67 and 67*,arranged one over the other. and each formed with a notch to co-operatewith the spring 68 and permanently secured to the face of the ear 67 bysuitable screws.

The brace 38 is located aproximately centrally with respect to the innersides of the frame of the machine. and functions to relieve strain uponthe type-bar segment and undue vibration resulting from operations ofthe key-levers and type-bars. This brace may comprise a sheet-metalsupport or casting and includes arms 38 and 40', and a mid portion 41'having perforations through which securing screws 42 pass to a fasteninglug 43' carried bv a fulcrum plate H which supports the bell-crank 15.The arm 38' is directed rearwardly from the mid portion 41'. and iscurved up adjacent its extremity and formed with a lug 45 arranged toface against the rear wall of the type-bar segment 22 near its lowerend, and is secured thereto by a suitable screw 46'. 'The curved arm 38'thus provides a substantial support and means for bracing the type-barsegment in a direction opposed to the strokes of the type-bars, andeffectually eliminates vibration or strain. The arm 46" is directedforwardly and upwardly to the bottom central portion of the type-basket47, the end of the arm carrying a perforated fastening lug 48' throughthe medium of which the arm is secured to the underside of thetypebasket by screws, rivets or in any other manner found suitable. Asthe type-basket 47 is supported at each end by a bracket 75 of the frameof the machine (see Figures 1 and 3) and intermediate the ends thereofby the arm 40' vibration is entirely overcome.

69 indicates a universal bar having a curvature to align with a circulargroove at the rear of type-bar segment 22, the bar being suspended inthis position by suitable ears formed in the bar that may be riveted orotherwise secured to ears on the frame 30. The movement of each type-bar18, in traveling to the printing position, will strike the universal bar69, in advance of the printing position and force the frame 30, and thesev- "eral parts mounted thereon, rearwardly in unison with sa1d bar;and under the reco1l of the spring 37, when the type-bar returns to itspad, frame 30 and the universal bar will be restored to normal position.

The rock-shaft 64, at a point adjacent the side frame of the machine, isprovided with an arm 70 with its free end connected to a wire 71 thatpasses upwardly and then forwardly under the ribbon-spool towards thefront of the machine, where the free 'end is formed with an eye toengage with a stud 72 fixed to one arm of a bell-crank 73, pivotallymounted upon a stud 74 fixed to a bracket 74' which is attached to apart of the bracket '75. This stud 71. as shown at Figure 1, is providedwith a compression spring 72 between the bell crank and the head of thestud. to provide a flexible joint at this point. and permits afinger-knob 75'. that co-operates within an irregular slot 76 in thefront plate of the machine. to have sufiicient latitude in any directionto form an interlock with different stop positions. as shown at Figure3. where the finger-knob 75' is shown at three positions. Thesepositions may be indexed by the use of three different colors adjacentthe three shift positions. The lefthand posit on R indicates the lowerfield; the middle position B. the upper field of the ribbon. and theright-hand position S. the inactive. or where the ribbon-actuator issilent. Itwill be noted that in shifting from the position B to theposition S there is a shoulder 76' to be overcome. This shoulder isprovided to prevent any tendency to ac cidently shift the finger-knobinto stencil poition when middle position is desired.

By referring now more particularly to Figure 7, the yoke piececomprising the two ears 66 and 67 is positioned in this figure to showthe co-operation of the other parts associated with the ribbon-vibrator57 that renders said vibrator inoperative relative to an upward strokethrough the movement of the stud 62 through the open slot in ear 66without resistance. This movementis shown at Figures 11, 12 and 13. AtFigure 11 the frame 30 is supposed to move in the direction of the arrowthrough an impulse from the universal bar 69, and move the slotted ear63 in unison therewith, to the dotted-line position shown in thisfigure, and in sodoing will cause the yoke piece 61 to follow themovement of the slot, and during this movement the stud 62 that alsoengages with the slot in the ear 66 will pass through said slot from theposition of Figure 12 to the position shown at Figure 13 withoutopposition from the slot to cause a throw ,of the yoke 61 andribbon-vibrator 57, the yoke idly rotating about its pivot. During thisoperation the yoke piece 61 has been vibrated in unison with the frame30, and the movement of the frame has operated the carriage-feedingelements to provide a letter-space movement, the ribbon-vibrator 57 hasremained inactive, and the ribbon has not been vibrated to cover theprinting position on the platen. Figures 1, 2, 3 and 8 illustrate ameans for controlling the ribbon-vibrator, and the different positionsmay be read from the red, black and white areas indexed at a frontshield has rotated with the rock-shaft 64 and the detent spring 68 hasbeen brought 1nto looking position with the middle detent. in the edgeof the shoe 67 The rotation of these parts, as-shown in Figure 9, hasthrown the open slot in therear 66 to a new angular position, and, whenthe frame is vibrated rearwardly, the slotted ear 63, through theengagement of the stud 62, will cause the yoke piece 61 to rotate aboutits pivot. In moving rearwardly with the frame 30, the stud 62 engagesthe lower edge of the sta tionary slot in the ear 66, and this slotbecomes a camming element to force the yoke piece 61 upwardly, and,through its pivotal connection with the ribbon-vibrator 57, both theyoke piece and ribbon-vibrator will move in unison, and, in passing fromthe full-line position at Figure 9 to the dotted position, will, causethe ribbon-carrier 60 to raise the upper half of the ribbon intoposition to cover the printing field of the types at the platen. Uponthe return of the frame 30 slotted ear 63 will carry the stud 62forwardly, and, in swinging the yoke piece 61 about its pivot, willallow the ribbon-vibrator 57 to drop to normal position.

index which is supposed to index red. This movement of the bell-crankcauses the arm 70 to shift to a new position, and, in shifting, torotatethe shaft 64. In this position the two ears 66 and 67 have rotatedto cause the slot in the ear 66 to assume a more acute angular stopposition, so that the detent spring 68 will engage with the third notchin the shoe 67. Here it will be seen that #the open slot of the car 66has assumeda moreacute angular relation to the stud 62,

and when the ear 63 that engages with the stud is moved rearwardly withthe frame 30, the yoke piece 61 will not rotate freely about its pivot,but will almost immediately ride up the inclined edge of the slot and become a camming element to lift the vibrator 57 to the dotted positionshown at Figure 10.

It will be seen that the slot in the car 66 is effective to move thestud 62 positively in both directions and that the side edges of s aidslot provide stops which prevent overthrow or bleeding of the ribbon.

The ribbon, in passing from the spool 78, passes over a conical idlerroller 79 mounted vertically upon an ear formed in the spool cup, andthis idler, through its taperinginclined faces, is designed to take upthe slack position to print capital letters and through,

the same printing field of the ribbon. This is due to the 'fact that theribbon-spools 78 and ribbon carrier 60 are both mounted to shift withthe carriage when a shift-key, not shown, is depressed. During thisshifting movement of the carriage, the stud 62 rises towardthe outer endof the slot in the ear .63, but this movement does not increase ordiminish the leverage of the ribbon-vibrator 57 'or any of itsassociated parts; said stud simply engaging said slot nearer its openend, as shown at Figure 11.

A type-guide includes a base 80 fixed to the upper front edge of thesegment 22 and a relatively short and thick stem-portion 83 formed withthin parallel flanged edges ,84 for supportingand guiding the ribboncarrier 60 in its movements to and from the rinting position. Theseflanged edges are extended beyond the top of the type-guide, asillustrated at 85, so that they may accommodate an extreme throw of theribbon carrier.

The ribbon carrier 60, as shown at Fi ures 4 and 5, comprises twoupright sections fbrming a fork 81 to straddle the typing position, andeach section formed with an ear 82 bent around to embrace the edges 84of the typeguide for support and guidance. Each section adjacent theedges of the guides is bent towardsits adjacent ribbon-spool and this.bent section comprises an open angular slot through which the ribbon isthreaded; and

through the joint action of the bend in the carrier and-the angularslot, the slack in one edge of the ribbon is taken up, and the ribbonassumes a uniform flat field-and has no tendency to curl.

From this description, it will be seen that the ribbon carrier issuspended by the ribbonvibrator and guided by ears that embrace theparallel edges of thel type-guide; that when the carriageis shifted, thecarrier is raised a \carriage-shift-distance and from this new positionon the guide, it will be vibrated to cover and uncover the printingposition.

It is to be understood that wherever the terms vibrating arm or actuatinarm are used throughout the specificatlon or claims, said terms includeany suitable form .r

of vibrator or actuator.

Variations may be resorted to within the connection between the Havingthus described my invention. I claim:

1. In a t-ypewriting machine, in combination. a main frame. a shiftframe movable to different case positions relative to said main frame.keys. a universal bar for said keys. ribbon-vibrating mechanism mountedin said shift frame reciprocating at typestrokes of the universal bar.said ribbonvibrating mechanism including a vibrating arm. an actuatingarm therefor. a member having an inclinable slotarranged to slidablyreceive the free end of the actuating arm. means for varying theefiective angle of said inclinable slot, and a universal bar actuatedframe mounted for movement relative to the shift frame including asliding connection to the free end of the actuating arm. said slidingconnection arranged to transmit motion from the universal bar to theactu' ating arm to cause a throw of the vibrating arm and to permit freemovement of the shift frame from one case position to another whilepreserving an invariable movement transmitting connection between theribbon-vibrating mechanism and its oper-- ating means.

2. In a typewritinganachine, in combination. a main frame, a shift framemovable to different case positions relative to said main frame, keys, auniversal bar for said keys, ribbon-vibrating mechanism mounted in saidshift frame reciprocating at typestrokes of the universal bar, saidribbonvibrating mechanism including a vibrating arm, an actuating armtherefor. av member having an inclinable slot arranged to slidablyreceive the free end of the actuating arm, means for selectively varyingthe effective angle of said inclinable slot. and a universal baractuated frame mounted for movement relative to the shift frame andincluding a slot substantially parallel to the direction of movement ofthe shift frame, said slot receiving the free end of the actuating armto transmit motion from the universal bar to the vibrating arm and topermit free movement of t e shift-frame from one case position toanother, while preserving an invariable movement transmittingribbon-vibrating mechanism and its operating means.

'3. In a typewriting machine, the combination with a platen and auniversal bar. of a multi-color'ribbon-vibrating mechanism including avibrating arm. an actuating arm associated with said vibrating arm. anelement reciprocating at strokes of the imiversal bar and imparting idlemotion to the actuating arm. a device including a stationary inclinablesurface disposed in the path of motion of said actuating arm. saidsurface efiecting a camming action against said actuating arm to cause athrow of the vibrating arm, and means for adjusting the degree ofinclination of said stationary surface to vary the extent of throw ofsaid vibrating arm, whereby any selected color-band of the ribbon may bepresented at the printing line.

i. In a typewriting machine, the combination with a platen and auniversal'bar, of a inulti-color-ribbon vibrating mechanism including avibrating arm. an actuating arm associated with said vibrating arm, anelement reciprocating at strokes of the universal bar and imparting idlemotion to the actuating arm, a device including a stationary inclinablesurface disposed in the path of motion of said actuating arm, saidinclinable surface effecting a camming action against said actuating armto cause a throw of the vibrating arm, said device also including meanssettable to determine the inclination of said surface to efiectdifferent throws of said vibrating arm, whereby to bring any selectedcolor-band of the ribbon to the printing'line. and means for effectingfine variations in the setting positions of said settable means, wherebyany portion of a selected color-band may be presented at said printingline.

5. Ina typewriting machine, the combination with a platen and auniversal bar, of a multi-color-ribbon-vibrating mechanism including avibrating arm, an actuating arm associated with said vibrating arm, anele ment reciprocating at strokes of the universal bar and impartingidle motion to the actuating arm, a device having a stationaryinclinable slot. the free end of the actuating arm being arranged toride in said stationary slot to cause a throw of the vibrating arm, andmeans for setting said slot to different selective angular positions todetermine the throw of said vibrating arm or to render the sameinactive.

6. In a typewriting machine. the combination with a platen and auniversal bar, of a multi-color-ribbon-vibrating mechanism including avibrating arm, an actuating arm associated with said vibrating arm. anelement reciprocating at strokes of the universal bar and imparting idlemotion to the actuating arm. a device having a stationary inclinableslot in which the free end of said actuating arm moves and is guided.said slot being effective to cause a throw of the vibrating arm uponoperation of the universal bar, means for selectively positioning saidslot at any one of a number'of different angles corresponding to throwsof the v brating arm for the different color-bands'and means foreffecting fine variations inthe selective Working positions of saidslotmvhereby any por tion of any color-band may be presented at theprinting line.

7. In a typewriting machine. the combination with a platen and auniversal bar, of a multi-color-ribbon vibrating mechanism including avibrating arm and a ribbon-carrier connected thereto, an actuating armassociated with the vibrating arm, means operated by the universal barand imparting idle motion to the actuating arm, and a device including astationary inclinable surface which is set-table at different angles inthe path of motion of said actuating arm, said surface eifecting alifting of said actuating arm to cause a throw of the vibrating arm, thesettable device including a sector having a series of notches adjustablewith respect to one another, and a detent for engaging the notches.

8. In a typewrit-ing machine, the combination with a platen and auniversal bar, of a multi-color-ribbon-vibrating mechanism including aVibrating arm and a ribbon-car rier connected thereto and mounted upon astationary part of the machine, an actuatingarm having one end movablyconnected to the vibrating arm, means operated by the universal bar andimparting idle motion to the free end of said actuating arm, and astationary sector having a slot therein, the free end of the actuatingarm being arranged to ride in the slot, said sector being adjustable tocontrol the angle of the slot with relation to the motion of the freeend of said actuating arm, the slot being effective to cause saidactuating arm to raise the vibrating arm to present the ribbon at theprinting line of the platen, the sector-adjusting means includingnotches and a detent for engaging the notches to determine said angle ofthe slotcorresponding to the different color-bands, said notches alsobeing adjustable relatively to one another to effect fine variations inthe extent of throw of the vibrating arm, for said diiferentcolor-bands.

9. In a typewriting machine, the combi nation with a platen and auniversal bar, of a Inulti-color-ribbon-vibrating mechanism including avibrating arm and a ribboncarrier connected thereto, the vibrating armbeing rockably mounted upon a stationary part of the machine, anactuating arm pivotally connected to the vibrating arm at a pointbetween said ribbon-carrier and the rocking point of the vibrating arm,means driven by the universal bar and imparting idle motion to the freeend of said actuating arm, said free end having a pin, anda deviceincluding a stationary sector having a slot therein, said pin beingarranged to ride in the slot, said sector being adjustable to controlthe angular position of the slot with relation to the direction ofmotion of said free end of the actuating arm, the latter effecting alift of the vibrating arm corresponding to the angle of the slot,whereby one color-band or another is presented to the printing line ofthe platen.

10. In a typewriting machine, the combination with a platen and auniversal bar,

of a multi-color-ribbon-vibrating mechanism including a vibrating armand a ribbon-carrier connected thereto, the vibrating arm being rockablymounted upon a stationary part of the machine, an actuating armpivotally connected to the vibrating arm at a point vibrate the ribbon,a series of notches ad-- justable with respect to one another and to thefixed notch, and a stationary detent selectively engageable with any ofsaid notches, the adjustable notches corresponding to different angularpositions of the slot, whereby any color-band of the ribbon may bepresented at the printing line of the platen.

11. In a typewriting machine, the combination with a platen and auniversal bar, of a multi-color-ribbon-vibrating mechanism including avibrating arm and a ribbon-carrier connected thereto, the vibrating armbeing rockably mounted upon a stationary part of the machine, anactuating arm. pivotally connected tothe vibrating arm at a pointbetween said ribbon-carrier and the rocking point of the vibrating arm,means driven by the universal bar and imparting idle motion to the freeend of said actuating arm, said free end having a pin,- a deviceincludingia stationary sector having a slot therein, said pin beingarranged to ride in the slot, said sector having a fixed notchcorresponding to a position in which the arm to vibrate the ribbon, aseries of notched elements having radial slots, headedv screws extendingthrough said radial slots and into the/bodyof the sector, whereby saidnotched elements are adjustable with relation to one another and also tothe stationary notch, a stationary detent for selectively engaging anyone of the notches to predetermine the angular position of thesector-slot with relation to the direction of motion of the free end ofsaid actuating arm, 'a shaft upon which said sector is mounted, anindex-device at the front of the machine and including a slothaving anoffset to form an abutment, the slot being continued to a point beyondsaid abutment, a finger-knob ,including a stem Which is guided by saidslot, and linkage between the finger-knob and the shaft, said fingerknob being operable to rotate the shaft to the different notchpositionsof the detent, whereby any selected color-band may be presented to theplaten .slot is ineffective to operate the actuating at the printingline, the abutment-portion of the slot of said index-device providing astop corresponding to the notch-position for one color-band of theribbon, the end of said slot opposite the abutment corresponding to thedetent-position for another color-band of the ribbon. the continuedportion of the slot being eii'ective to determine the silent position ofthe ribbon.

12. In a typewriting machine, the combination with a platen and atype-bar segment.- of a typegiiide including a base fastened to saidsegment, said type-guide also including a relatively short and thickstemportion terminating at its upper end in guides for the type, saidstem being reduced at its side edges to form thin flanges, and aribbon-carrier including eyes for the ribbon and tabs bent around saidthin flanges. close beneath the eyes, to support and guide said carrier,said flanges being extended beyondthe top of the guides for the type,whereby the carrier is supported in an extreme throw of the ribbon abovesaid relatively short stem.

13. In a typewriting machine, the combination with a varied pathribbon-vibrating mechanism including means for setting the mechanism, soas to control the extent of movement of a ribbon-carrying vibratingelement to two positions of a bichrome ribbon, or rendering saidmechanism inefl'ective to move the ribbon, of a frame having a slotopening formed with an oflset providing a shoulder in said frame, andaconnection from the setting means arranged to ride in the slot toregulate the. adjustment of said setting means. said shoulder acting asa stop in the path of movement of the connection, so as to prevent adirect throw of said connection from ribbon-vibrating position to theposition in which the mechanism is ineffective to vibrate the ribbon.

14. In a typewriting machine, the combination with a varied pathribbon-vibrating mechanism including means for setting the mechanism soas to control the extent of movement of a ribbon-carrying vibratingelement to two printing positions of a bichrome ribbon, or renderingsaid mechanism ineffective to move the ribbon, of a frame having a slotopening therein. said slot having a double right angular bendintermediate its extremities to form an oifset slot and a shoulder inthe frame, a bell-crank lever pivoted for movement adjacent the slot,one arm of the lever terminating in a handle arranged to ride in theslot to regulate the shift of the setting means, an operating connectionbetween the setting means and the other arm of the lever. means forcausing the handle to bear against one edge of the slot, the shoulderformed by said ofi'set slot providing a stop in the path of movement ofthe handle, so as to prevent a direct throw of said handle from theribbon-vibrating position to the position in which the mechanism isineffective to vibrate the ribbon, and means for identifying thedifferent setting positions of the mechanism, controlling the extent ofmovement of the ribbon-carrying vibrating element.

15. In a typewriting machine, the combination with varied pathribbon-vibrating mechanism including means for setting the mechanism, soas to control the extent of movement of a ribbon-carrying vibratingelement to two positions of a bichrome ribbon, or rendering themechanism inoperative to move the ribbon, of a frame having a slotformed with a double rightangular bend to provide an abutmentintermediate its extremities, and a connection from the setting meansarranged to ride in the slot to regulate the adjustment of said settingmeans, said abutment acting as a stop in a straight path of movement ofthe connection, from one end of said slot to said abutment, so as toprevent a direct throw of said connection from ribbon-vibrating positionto the position in which the ribbon-vibrating mechanism is inactive, theother end of the slot being in a plane to one side of theaforenamed-portion of the slot, due to said double right-angular bendand constituting the position of said connection for silencing saidvibrating element.

16. In a tvpewriting machine, ribbon-vi brating mechanism including avibrating arm, an actuating arm associated with the vibrating arm, arevolublv shiftable member formed with an arcuate edge having a series'of notches, a detent engaging the notches to hold the member inposition, said member also having a slot, the free end of said actuatingarm being arranged to slide in the slot, means for imparting motion tothe actuating arm, said slot being inclinable at an angle 'to thedirection of movement of said motion-imparting means to cause a throw ofthe vibrating arm when said actuating arm is operated, and means forrelatively varying the effective angle of said 'slot.

17. In a typewriting machine, ribbon-vibrating mechanism including avibrating arm, an actuating arm associated with the vibrating arm, arevolubly shiftable member formed with an arcuate edge, separate shoepieces having notches therein ad ustably se-: cured around said arcuateedge, so as to adjustably vary the distances between the notches, adetent engaging the notches to hold the member in position, said memberalso havin a slot, the free end of said actuating arm being arranged toslide in the slot, means for imparting motion to the actuating arm, saidslot being inclinable at an angleto the direction of movement of saidmotion-imparting means to cause a throw of the vibrating arm when saidactuating arm is operated, and means for relatively varying theeifec'tive angle of said slot.

18. In a typewriting machine, a ribbontlirow setting device including asector, a series of separate shoe-pieces adjustable with respect to eachother arranged around the curved face of the sector, each of saidshoe-pieces having a notch therein, means for securing the shoe-piecesto the sector, and a detent for engagement with said notches to maintainthe sector at any one of a number of different angles.

19. In a typewriting machine, a ribbonthrow setting-device including asector, a series of separately adjustable shoe-pieces arranged aroundthe curved face of the sector, said shoe-pieces having slots, set screwspassing through the slots into the sector, each of said shoe-pieceshaving a notch in its outer face, and a detentrfor engagement with thenotches.

20. In a typewriting machine, ribbon-vibrating mechanism including avibrating arm, an actuating arm associated with the vibrating arm, arevolubly shiftable member having an arcuate edge, separate shoepieceshaving slots therein, said shoe-pieces arranged around said arcuateedge, set screws passing through the slots into the shiftable member toadjustably secure the shoe-pieces thereto, said shoe-pieces havingnotches formed in their outer faces, a detent engaging the notches tohold said member in adjusted position, said member also having a slot,the free end of said actuating arm being arranged to ride in the slot,and means for imparting motion to the actuating arm, said slot beinginclinable at an angle to the direction of movement of saidmotion-imparting means to cause a throw of the vibrating arm when saidactuating arm is operated.

ALFRED G. F. KUROWSKI.

